The things that can be done with a Tag. TagTask and
ResetGroupStopTask are for tags with Maximize or Minimize OP
values. ResetOrbitTask and EnterOrbitTask and LeaveOrbitTask are
for tags with Orbit OP value.

Internal type to repesent the commands for the tagged transition.
The outer IntMap is for the destination Index and the inner IntMap
is for the Source Index. This is convenient since all runtime data
going to the same destination must be compared to find the best.